<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>双飞翼布局</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body, html {
            width: 100%;
            height: 100%;
            min-width: 60rem;
        }

        aside {
            width: 10rem;
            height: 100%;
            background-color: cyan;
        }

        main {
            height: 100%;
            width: calc(100% - 20rem);
            background-color: gray;
            /*margin-left: 10rem;*/
            float: left;
        }

        main .top, main .bottom {
            width: 100%;
            height: 5rem;
            background-color: lightsalmon;
        }

        main .center {
            width: 100%;
            height: calc(100% - 10rem);
        }
    </style>
</head>
<body>
<aside style="float:left;"></aside>
<main>
    <div class="top"></div>
    <div class="center"></div>
    <div class="bottom"></div>
</main>
<aside style="float: right"></aside>
</body>
</html>
